- 责任者：Qiao Wenlang (Guizhou Academy of Geological Survey ; Guiyang 550005 ; China) ; Wang Jianguo
- 刊名：Chinese Journal of Geology
- 出版年：2013
- 卷期：48(3)
- 关键词：冰碛岩 ; tillite ; 贵州 ; Guizhou Province
- 页码：p.847-859
- 图表：5 illus., 3 tables, 42 refs.
- 分类号：0803
- issnNo：ISSN0563-5020
- isbnNo：CN11-1937/P
The Nanhuan is a key period of one of the most important intervals in Earth＇s history marked by dramatic climatic, environmental changes. Here we present the geochemical variations through the Nanhuan succession from Jiaokai on the Yangtze block, south China,in order to investigate changes of palaeoenvironment and palaeoclimate. Relatively,low values of chemical index of alteration（CIA） ,Ti/Al of Tiesiao Formation, suggest a cold, dry climate and thus low source supply and glaciation period. In contrast, high values of CIA, Ti/Al of Longli and Datangpo formations, indicate a warm, humid climate and thus low source supply and interglaciation period. Variation in values of CIA, Ti/Al of Nantuo Formation indicate a warming and cooling cycle and thus a interglaciation to glaciation cycle The relative temporal coincidence of low magnitude of positive Eu anomalies and transition from glaciation to interlgaciation suggests that greenhouse gases （CO2, CH4 ）from hydrothermal venting could be one of the main controls on the demise of glaciation.